Flanged roller



Dec. 29, 1970 RQSENKRANZ ET AL 3,550,231

FLANGED ROLLER Filed March 21, 1969 2 Sheets-Sheet 1 DIETER RQSENKRANZKURT GORGEN 1NVENTORS- BY 7 To);

ATTORNEY Dw 1970 D. ROSENKRANZ FLANGED ROLLER 2 Sheets-Sheet 2 FiledMarch 21, 1969 FIG.4

FIG.5'

FIG.6

z m N O A m R E KN V NE N am .0 G m. m EU DK BY ER! ATTORNEY UnitedStates Patent 3,550,231 FLANGED ROLLER Dieter Rosenkranz,Wuppertal-Barmen, and Kurt Giirgen,

Neviges, Germany, assignors to Firma Hacoba-Textilmaschinen G.m.b.H.,Wuppertal-Barmen, Germany, a corporation of Germany Filed Mar. 21, 1969,Ser. No. 809,155

Claims priority, application Germany, Mar. 29, 1968,

Int. Cl. B21b 31/00 US. Cl. 29-123 7 Claims ABSTRACT OF THE DISCLOSURE Ahollow roller member of generally constant outside diameter has aprogressively decreasing wall thickness as measured from thelongitudinal roll center towards each end thereof. A ring member havingexternally disposed, radially projecting elements is embedded within theroller body at each end thereof. A roll end flange is secured to eachring.

Our present invention relates to a flanged roller of the type used forthe winding of yarns, fabrics or the like, such as the warp booms andtake-up booms of looms.

Conventional methods of making the tubular roller bodies by extruding atube of indefinite length, which is subsequently cut into sections, arenot very economical. Since the extrusion process requires a constantwall thickness, the latter must be chosen so as to afford sufficientstrength at the point of greatest stress, i.e. at the center, eventhough lesser wall thicknesses would suffice at the ends of the rollerbody. Thus, the conventional manufacturing process involves theexpenditure of more material (e.g. aluminum) than would be required forstructural reasons, this also resulting in an unnecessary increase inthe weight of the roller.

The general object of our present invention, therefore, is to provide aroller for the purpose set forth whose wall thickness corresponds morenearly to the expected stress distribution and which therefore may be ofa lighter weight than equivalent rollers of the prior art.

A related object is to provide a simple process for seriallymanufacturing such rollers in an economical manner.

More specifically, our invention aims at providing a convenient methodof molding the body of such a roller from suitable casting material(e.g. aluminum or glassfiber-reinforced synthetic resin) in a mannerallowing the attachment of two disks or check plates to that body toform its end flanges.

These objects are realized, pursuant to our present invention, by thecasting of a tubular body in an annular space between the inner wall ofa cylindrical mold cavity and a pair of generally frustoconical moldcores inserted into the cavity from opposite ends thereof, the casingthus produced having a wall thickness which is greatest at the centerand progressively diminishes toward the ends. The technique oflow-pressure chill casting is particularly suitable for this process.

In order that the cast tubular body may be conveniently fitted with apair of end flanges, we prefer to place a pair of internally threadedrings of metal or other suitable material, not necessarily identicalwith that of the roller body, on the two cores so that these ringsbecome imbedded in the mass of the molded workpiece. Disks withexternally threaded bosses can then be screwed onto these ends to formthe flanges or cheeks of the roller.

The mold cores and/or the cavity may be grooved, ribbed or otherwiseshaped to produce complementary formations on the inner or outerperiphery of the roller body, e.g. for purposes of reinforcement or tofacilitate the anchoring of the yarn thereto when the roller is to beused as a warp or take-up boom.

The above and other features of our invention will become more fullyapparent from the following detailed description given with reference tothe accompanying drawing in which:

FIG. 1 is an axial sectional view of a flanged roller made in accordancewith our present invention;

FIG. 2 is a fractionary sectional view, drawn to a larger scale, of anend of aslightly modified roller according to our invention;

FIG. 3 is a cross-sectional view taken on the line III- III of FIG. 1;

FIG. 4 is a view similar to FIG. 3, illustrating a further modificationof a roller body together with a mold therefor;

FIG. 5 is a fragmentary top view of the roller body shown in FIG. 4;

FIG. 6 is an axial sectional view of another modified roller bodyaccording to the invention; and

FIG. 7 shows, in axial section, a mold designed to produce the rollerbody of FIG. 6.

In FIG. 1 we have shown a tubular roller 10 whose inner peripheralsurface 11 has the shape of a double frustocone, the thickness of thebody thus decreasing progressively from the center 12 toward the twoends. Imbedded in these ends are a pair of rings 20 bearing internalthreads 21 with an inner diameter equal to the largest diameter of theinner wall surface 11. These threads mate with outer threads on bosses31 of respective end disks 30 which are of substantially larger diameterthan the roller body so as to form a pair of end flanges thereon. Thedisks 30 are provided with center holes 32 for the passage of a mountingshaft not shown.

Roller body 10 is further provided with an array of peripherally spacedreinforcing ribs 14, see also FIG. 3, which terminate at the centralridge 12, being thus spaced from the roller axis by a distance equal tothe radius of that ridge.

As illustrated in FIG. 2, the ends of roller body 10 may be recessed at13 to receive projecting formations 22 of rings 20, these formationsbeing either continuous (i.e. an annular ridge) or peripherally spaced.Thus, the ring 20 of FIG. 2 is positively interlocked with the rollerbody 10 molded therearound.

FIG. 2 also illustrates a detail of ring 20 designed to prevent theentry of molding material into the threads 21. Thus, the ring is shownto have a shoulder 23 flush with the cylindrical terminal portion of theinner roller periphery 11, this shoulder being separated from thethreads 21 by an annular groove 24.

FIGS. 4 and 5 show a modified roller body 10 whose peripheral wall isdeformed at 18, in the vicinity of a radial plane P, to form an outergroove 15 extending longitudinally of the roller. This groove isdesigned to accommodate an anchor bar, not shown, to which a set of warpthreads may be fastened and which in turn may be temporarily attached tothe roller with the aid of straps hooked into keyholes 16 as is wellknown per se.

FIG. 4 also illustrates an iron shell 40 to be used as a mold for thechill casting of roller body 10', the shell being provided with an innerperipheral rib 41 to define the groove 15. As indicated in dotted linesin FIG. 4, the end rings 21 may in this case be formed within a. gapaccommodating the rib 41. Naturally, rib 41 would be omitted if the moldwere used to cast a roller body Without groove 15, such as the one shownin FIGS. l-3.

FIG. 6 shows a roller body 10" which differs from the previouslydescribed bodies by having a central partition 17 at the location of itsminimum inner diameter.

Although this partition could be made solid so as to split the centerbore of the roller body into two separate halves, the embodiment shownin FIG. 6 has this partition formed with an axial aperture 19 wherebythe roller can be mounted on a throughgoing shaft. For this purpose,advantageously, the diameter of aperture 19 is equal to that of thecenter holes 32 (FIG. 1) of disks 30, thus letting the partition 17 cometo rest on the mounting shaft as a supporting web.

Reference will now be made to FIG. 7 for a more detailed description ofthe manner in which the roller bodies shown in the preceding figures maybe produced. The cylindrical mold shell 40, defining a cavity 42, isopen at its ends to receive a pair of symmetrical frustoconicallytapered cores 50, each with a cylindrical neck 51, carried on an endplate 52. The rings 20 have been slipped onto the necks 51 of therespective cores which, in order to produce an internally partitionedroller body of the type shown in FIG. 6, are axially spaced apart andare traversed by a removable central rod 53 defining the aperture 19 ofFIG. 6. The rings 20, particularly if they consist of a materialdifferent from that of the mass which is to form the roller body, areadvantageously preheated before being slipped onto the cores 50. Themolding material is then admitted at low pressure into the annular spacebetween cavity wall 42 and cores 50 to form the roller body and to fusewith the hot rings 20 into a unitary structure. After chilling andhardening of the molded workpiece, the mold may be opened by removal ofthe end plates 52 to allow the cast body to be extracted.

If the roller body is to be internally ribbed, as illustrated in FIGS. 1and 3, the cores 50 will have to be externally grooved as will bereadily understood by those skilled in the art. It will also be apparentthat projections on these cores, conforming to the keyholes of FIGS. 4and 5, may be provided on the cores 50 and will be sheared off when themold is opened.

It will thus be seen that we have provided a method of making rollerbodies of various configurations in a single casting step, without theneed for subsequent machining to form grooves, holes, or threads for theattachment of cheek plates.

We claim:

1. A roller comprising:

a tubular body having a centrally located, longitudinal boretherethrough;

the bore diameter progressively increasing from the body center towardeach end;

the outer diameter of said body being substantially constant whereby thewall thickness of the body is greatest at the center and decreasestoward the ends;

a pair of internally threaded rings, each having a plurality ofexternally disposed radial projections thereon;

one of said rings, including said projections thereon,

being embedded at each end of said body and concentric with said bore;and

a pair of disks having each a threaded boss portion matingly engagingone of said rings, said disks forming end flanges for said body.

2. A roller as defined in claim 1 wherein said body is formed with acentral transverse partition bisecting said bore.

3. A roller as defined in claim 2 wherein said partition is providedwith an axial aperture.

4. A roller as defined in claim 1 wherein said body has an externallongitudinal groove.

5. A roller as defined in claim 4 wherein the periphery of said body isinwardly deformed in the vicinity of a radial plane to form said groove.

6. A roller as defined in claim 1 wherein said body is provided with anarray of peripherally spaced inner longitudinal ribs.

7. A roller as defined in claim 1 wherein said body is provided with atleast one throughgoing radial hole.

References Cited UNITED STATES PATENTS 32,954 7/1861 Allender 29-12335,335 5/1862 Wringer 29-123 331,328 12/1885 Randall 29-123X 540,0435/1895 Brewster 29-123 562,542 6/1896 Kohl 29-123 732,728 7/1903 Forsyth29-123 978,080 12/1910 Vieser 29-123X 1,018,457 2/1912 Vieser 29-1271,089,017 3/1914 Smith 29-123 1,430,418 9/1922 Vedder 29-123X 1,504,1798/1924 Biddwell 29-123 1,874,560 8/1932 Lucas "29-123 2,918,867 12/1959Killary et al. 29-123 2,940,388 6/1960 Schaefer 29-123X 3,019,511 2/1962HOrnbostel 29148.4X

FOREIGN PATENTS 539,220 9/ 1941 Great Britain 29-1484 976,679 12/1964Great Britain 29-1484 1,018,864 2/1964 Great Britain 29-1484 MORRISKAPLAN, Primary Examiner

